Iridium spark plugs in the wetheads

[PGlaves]

I found this thread while looking for a less costly alternative to OE spark plugs. And ordered them from Amazon . I have a point I'd like to make about the life of these plugs. BMW's K bikes have factory recommended 18k renewal intervals. I believe the theory that they want them changed along with other services at the same time. But for people like us doing our own service going longer should not spell doom for our engines. I am in the habit of changing mine at 12k intervals but am not going to worry one bit if they end up in there for alittle more. I wouldn't feel good leaving them in there more than 18k though.

I check for mixture issues every major service. I also check or regap as needed. But I have run spark plugs as long as 50,000 miles with fine performance.